Table 2.
Parameter estimates (95% confidence intervals) from mixed effects models predicting of the probability of abdominal obesity over the adults life course
| Model 1 | Model 2 | Model 3 | |
|---|---|---|---|
| Age | 2.60(2.46,2.74) | 1.82(1.49,2.14) | 1.508(1.132,1.885) |
| Age2 | −0.018(− 0.019,-0.017) | − 0.011(− 0.014,-0.007) | −0.008(− 0.012,-0.004) |
| Gendera | − 0.065(− 0.075,-0.055) | −0.105(− 0.125,-0.086) | −0.100 (− 0.121,-0.080) |
| 1997b | 4.85(3.66,6.04) | − 6.98(− 16.33,2.37) | −7.67(− 18.09,2.75) |
| 2000 | 10.98(9.81,12.15) | −17.78(− 27.32,-8.24) | − 21.15(− 32.14,-10.17) |
| 2004 | 14.48(13.27,15.69) | −15.53(− 25.75,-5.30) | −18.84(− 29.88,-7.80) |
| 2006 | 15.06(13.83,16.28) | − 11.98(− 22.49,-1.47) | −17.47(− 28.84,-6.10) |
| 2009 | 19.40(18.17,20.64) | − 9.94(− 20.42,0.54) | −13.17(− 24.50,-1.84) |
| 2011 | 22.49(21.29,23.70) | −7.10(− 17.16,2.95) | −11.67(− 22.60,-0.74) |
| 1997*Gender | 0.027(0.004,0.051) | 0.030(0.005,0.056) | |
| 2000*Gender | 0.039(0.016,0.062) | 0.042(0.017,0.068) | |
| 2004*Gender | 0.036(0.012,0.060) | 0.049(0.024,0.074) | |
| 2006*Gender | 0.041(0.017,0.065) | 0.048(0.023,0.074) | |
| 2009*Gender | 0.044(0.020,0.068) | 0.052(0.027,0.077) | |
| 2011*Gender | 0.071(0.048,0.094) | 0.079(0.055,0.103) | |
| 1997*Age | 0.519(0.100,0.938) | 0.497(0.033,0.961) | |
| 2000*Age | 1.21(0.787,1.631) | 1.317(0.838,1.795) | |
| 2004*Age | 1.257(0.815,1.698) | 1.318(0.841,1.795) | |
| 2006*Age | 1.046(0.598,1.494) | 1.200(0.715,1.685) | |
| 2009*Age | 1.115(0.670,1.560) | 1.143(0.660,1.626) | |
| 2011*Age | 1.126(0.699,1.554) | 1.205(0.740,1.670) | |
| 1997*Age2 | −0.006(−0.010,-0.001) | −0.005(− 0.010,-0.0004) | |
| 2000*Age2 | −0.012(− 0.016,-0.008) | −0.013(− 0.018,-0.008) | |
| 2004*Age2 | −0.012(− 0.0170,-0.008) | −0.013(− 0.018,-0.006) | |
| 2006*Age2 | −0.010(− 0.014,-0.005) | −0.011(− 0.016,-0.006) | |
| 2009*Age2 | −0.010(− 0.015,-0.006) | −0.011(− 0.015,-0.006) | |
| 2011*Age2 | −0.011(− 0.015,-0.006) | −0.012(− 0.016, − 0.007) | |
| Ethnicyc | 0.030(0.003,0.057) | ||
| Marital statusd | 0.035(0.022,0.047) | ||
| Community urbanicitye | 0.160(0.130,0.191) | ||
| Education years | −0.222(− 0.289,-0.155) | ||
| Household incomef | 3.47E− 4 (2.23E− 4, 4.70E− 4) | ||
| Community urbanicity*household income | -4.67E−6 (− 6.27E− 6, − 3.08E− 6) | ||
| intercept | −40.13(− 43.41,-36.85) | −20.26(− 27.33,-13.19) | −21.94(− 30.45,-13.43) |
aGender was a dummy variable coded 100 for males and 0 for females and with 0 as a reference category
bSurvey year was a dummy variable with 1993 as a reference category
cEthnicity/race was a dummy variable coded 100 for ethnic Han and 0 for other minorities and with 0 as a reference category
dMarital status was a dummy variable coded 100 for Married and 0 for others and with 0 as a reference category
eCommunity urbanicity was measured at the community level on a 12-component continuous scale ranging from 0 to 120 with higher values corresponding to higher levels of urbanicity
fPer capita net annual household income was calculated at the household level for each survey year and inflated to 2011